Re: 5.1 Surround-to-stereo AU (Brian
Re: 5.1 Surround-to-stereo AU (Brian
- Subject: Re: 5.1 Surround-to-stereo AU (Brian
- From: Brian Willoughby <email@hidden>
- Date: Fri, 6 Feb 2009 14:48:04 -0800
As I mentioned, some future driver could support AU hosting - in
fact, if you develop a custom audio driver that does what you want,
then you could write it to host an AU or an entire graph (no
guarantees that this will actually work inside an audio drive, but it
seems possible). This would only be a clear advantage to you if an
AU already exists which implements the down-mixing you want.
Otherwise, you might as well just code in the down-mixing in your
driver permanently.
I've long desired a mechanism in OSX or CoreAudio to load mastering
AUs into my listening chain. There are so many raw recordings on the
internet, and it helps to process them before listening. There have
been plugins for iTunes which implement mastering-style processing,
but those limit your listening options to the audio file formats that
iTunes is limited to. Now, I have the Metric Halo Labs ULN-2
FireWire audio interface, which allows me to insert processing on all
audio coming from the computer (from any application) if I so desire,
and this has alleviated my motivation to explore ways to process
audio between standard applications and the standard audio drivers.
Good luck, and let us know if you meet with success!
Brian Willoughby
Sound Consulting
On Feb 6, 2009, at 14:38, Ernest Burghardt wrote:
Thank you for the enlightenment, it is unfortunate, the AU sounded
like it would be such an elegant solution.
I will search the archives for the examples you mention, which are
what I originally expected I would have to do.
I was a little mislead by the OutputUnits>AUHAL>HAL>IOKit flow into
thinking that I could do an AU as a "user-mode driver"...
Ernie
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